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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4198cb78f445e8c2eb30276223f98d8fba5b8aac549dc51ff0266aa5180d11fc' 
  AND token = 'goZsPMAo88EGG8c6Egsso0zvGK1q3CywLvGLYRlGXA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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