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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2539cb032f4da2056550e51b77255a6d40167f30ba79a1ea82df3b603c9e282' 
  AND token = 'q2qdBKA46rect3ETvCEjrNlR34iZLGyOan/Po9T7xkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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