SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c74c4b264755fbb3eeeaf90f4db27bf5532704a661273b25dd084188dc13d6f' 
  AND token = 'KYAS6F+unl78B9j/L368/W+t7cyifsVJbVpIAzNmNLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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