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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e8bbbb2389c24afacee09e1fbcac4f59c3c7b49c7a96da872a7e74b56b7b5da' 
  AND token = 'MFHQFb6DnfyaRepv2MLssoRhpyZbSLnFlvfsNCNBNXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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