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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd881205995bef021222ac54aa3ecef3320d8bb7c646046222e56bf7749fc492' 
  AND token = '25jThdoBrWetOgXq7h98V8dMJ/RZY4l7oFDn99+eoco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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