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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13c5e6126b50a6f680ad6e3b3a7e69aafbe7d30094b90c06524545620d76d4cf' 
  AND token = '21vKxZ4dFURu2k/UyTwEUi+ds1eP3jGKeZNzqW3Gu5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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