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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f288f76e19033534ece97d968bd059a412c6df923a9b5a1c70dfad092897d6fa' 
  AND token = 'j2WNXEAlbGWy3ojEMabtcQQbWHjDz8f8i5d6s11Bq8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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