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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e16a4a18e8b6ca908b0a1b7ed1547bdcbee611339a35415e7049c17ca33ff0e5' 
  AND token = '8PXUS7ALT7mXl/RKZcN14AdXBEHT5o7NP/ubLi+MbAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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