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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cf1b8cb992955432ed7321a39bc93d3ec7157d341b9e9750210d91cdfbcabe8' 
  AND token = 'k0wjgWecp66PliKKMv66MAfNrZLeAe9ByiRvbmSVC+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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