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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90c4caed1487b0136f60e453fa5e413fddef48e90a54212d5182bc6cec0880ee' 
  AND token = 'AFl1rvPNXHxN/z1kMnpTdr30BeWRFSM9PZuvKjBDv9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}