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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d2dc5f3c53b93cdb430e7dbb78a50642709b25676b17593fb63a259d925a6e9' 
  AND token = 'y3sfXqDqG5qlttqwvfBrDPehILAclB9WUX5zqzk1/Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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