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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86ea7575eee07091bc64bbeeb3c5d9ea9dd87ad9929318411115d003c14d7255' 
  AND token = 'UQmRrZltzCwn+fev4CiVxsxyFhJrx6Z3hCwcvHkNTXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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