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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c24e170b618289b9918666b9532cfab5badeea4762c365935580a65bc361bd8' 
  AND token = 'SAYzRKhQllbawGOWzckpgq4PxelFql3Q5bqcc6OGUJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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