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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67d438163b8e169c6439c12b10a7a3553596b1497cb903810ca090134893b18a' 
  AND token = 'EMtIFkFMIuEkovgkspQkIxu1zorKEaKznQEF0GPTZjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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