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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfd4ec6736d01d592f3db15ba86ec17a1083b76b5fc308a319f4d7f527df95e8' 
  AND token = 'C/CSUgOdkAG6j8C5UTaojYkyXNPDk/H/w46m8xULfRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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