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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dffc985a2c2ab52994269e452f1e3758a478a32db9b0cffd994488b4963cc4b2' 
  AND token = 'QWWpWOkMb7DkVeFSthuQqhyXZmAU/ZcGhqk4yDaePs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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