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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b515ec2d09f8219f2fb19bcbd292eb979c06d5af8a636ba4761a6ce81c16dc3' 
  AND token = 'duSkdN/3/q1SVkH3GIRUI5IE9/Q+liMoQitwEyx51B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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