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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a6a34eec504ba630550213518095c7554c4e958b5918bf4652a38c4b5938660' 
  AND token = 'bMRBIWwtzsbtHcopcCESbFVWxvUCmFbjwHEwPhopRbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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