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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7b0b7d1906041018bcb069f058df645ee0ad497afc2a7cad76e5c9b594ccb25' 
  AND token = 'poyM5mUUo6dQB5ikH2Af95fTvOBo5yy2RsGCY4+Fpkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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