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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfcfc08440b1e289658c54e3e2daeb6f6405023a60d38720b0d5c9be59a31953' 
  AND token = 'UTL755/nbrbRyqIYnZHcZ0Sy5ANLFE8NMtbquNhHT2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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