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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '319a65e5b23e95fbb2abb3a0f03a5965ea5b0ed10d0dc11fb6687c40ce7cbf7f' 
  AND token = 'v5EKdWyvBbLUdRhdLbD9/v60NtlGJJonDM5FklE/9+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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