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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b4710b46781a9d0d786d5c6e616666c1d8348f21ebd1bde199b1eb33d88cb5f' 
  AND token = '+P+7dq32F9baXlu5t5HeC8IIdQivFiloyY5E0hbcL3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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