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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d667fde9ca28d406ee888171b1ac1c2730f1ef91a3a5727d5fd46f3ff439440' 
  AND token = 'gdkQnUNOdp3aXplK3v4QxjmxwoR4u4g0aeai4P9aoSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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