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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7f2f2d07d9aaf3fab534ba021578dd09c7b06c13212254cb389cc9026e5b156' 
  AND token = '/HuoOqxeAxEn67uRvy1HgwxxOEcivkGEQfl8QMK9tL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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