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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b78377cbc2fde116a2edbf29a8009c2030554d043e54ce26fa14ef668ee04e5c' 
  AND token = '2Mk5QOrSmtYMfHcb71K/zBA17FoVILrS5gFQuYeKtn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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