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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e5262770a253b22fbb64f164ab1f5ebb2eb9ceceeb6b46840e5c7ec7dae0eac' 
  AND token = '3Q9diOqtN8a/PNRja8tcTXOpTVHxYUeY254FvXTNyEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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