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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b88258a80646ca7cda59056d46c7795565f1992c2b0a47b5b40db358a1b399f' 
  AND token = 'x1IX1bfrBzdt1Ab7jWDMAzoyy0BxCAcd8kEAr2U7MEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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