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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '960aee2b10b4d308698fd14afadfeb81e43e0d9d9dc051078b9b4d29a429ecdb' 
  AND token = 'hN8VJnkIdLA5877jm76TOX6haprp2B+IpdgOFWl9B20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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