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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c850216d207d117ec2b2bcf367839b06b9ce94d0788aa787a96eef0d5c9b15b' 
  AND token = 'fR+dLUsQ2rL2lruASkoatpVyLwYAScdCmQaxFx3en5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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