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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c35ee7dc845b949c795758147e02ced78eed9bbd8d77fb8bf4dacdd9a9c8672' 
  AND token = 'XeZt+dqRKmOMUG5Pzr1iau0v/5ez6IHN58z41Ac9T2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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