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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ac7326d2fd203040af57c8c036410c4be092e5f533cc39c7b7d73dc5202dda8' 
  AND token = 'crG2FgS6jkZPXm843DjM/wIICj7eLrdQDtCb+rQZLvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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