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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4a6ef7ee6598f097b006fe314a250747020e23040c54064bf1c9a438b4d2e2c' 
  AND token = 's/gIBTXWdZwxjlNDczZrXrC5bShh8ixWRAqkha3WrkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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