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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33d69fbdd575866a73b5d4ed8ed51dff0d2033d0317a93b7b36fa08c6c1de8cc' 
  AND token = 'aF9kSbpSGqqnwN1IXn7jV5W2ua6Qx7ZtWtrQA7tZ9+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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