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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e4253e5f5a017c48e033e9a3875a6ac43a3847acbeec52add538ec92df935f9' 
  AND token = '6xF8fBiYXqtta71ffXAoHot6Z7V39JG4AZSEdTXkEls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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