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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7cb42fae6709e78391c2a081daccd4a5383054cc1a3dbd8c654a99808fb401b' 
  AND token = 'OkS5MIDymNHs0tOlSkEHkkAFYQ7jvSEkcda5FVBtMsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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