SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b65f1ad077e84d814ac0cc6612b2ac863c18f019bf9c061b837680024f87f759' 
  AND token = 'CYV/XXac2jsQR6YvqZzev2edMLM7MVfgJyTlQz0Ym4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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