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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfa3417206746ec0cc13309ad60803d7dfaf8c4f1f643864c18799a6f1fc74cd' 
  AND token = 'jD05iKymU6NVNXfm9rMek23Zzu6F/V7tD5J1Okkgy3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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