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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd16548c5ef208545cda4298b2b6b03acacaa45b5d360ae09363f83be559ba3dd' 
  AND token = 'A2hkB31rhNjpymkFtkvHeRMH+L1s1hBbEgrK1FsUz70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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