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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9b48b294c03089b74d5cdea07064ae38b4c0d320eab7d065791add9dc615357' 
  AND token = 'PXo0B43kbHEGdRs8bB6cMjv3Bmu+llrgqjizjAZKOyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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