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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7b9cc096fdcba47a2aa2c79f77c56f64a308839ef8c1836c398e07a4043e114' 
  AND token = 'JdlJx0rDp3+NIkzj+YilRmchcR0Kwcz24pZjSrVV9mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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