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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6d4b4827bea9dbf2d8c2d34e76e7d9e35074c803ac0f8ef27ad9c4175282682' 
  AND token = 'k6evKnitA8zV01DU3fgHVU0qdEHedFUqGHcoTzRKHrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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