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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65ee15ad88d6bd4c3be79aa2455e9bfd712a0e910744ea2c6fd18941e32365c3' 
  AND token = 't8OhDrT2h6kCAmLXiD5bt9Bw3bcX1hEWfTknrdE+O3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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