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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac047f6fe75630d46652206f7a94cb4e5bf47a2fa31b15f3ad8e5c1fe4e97b9d' 
  AND token = 'Z0iks7JqksSk/Us1DVJmpqq+y61UvLE4NzQsAJTrCjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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