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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c17865b020699afb68a6d7e201c5971b8d5df88a9b45fb8660d0dbf0aa798ba8' 
  AND token = 'gT8NRVRhd4fT99nwTyO1pI22Dsw8pueZaq4Fc1iXNAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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