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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b34e1bd1d183579cb17c650d4a3a66075065ea8d3f22f22f705e30358b92fe6d' 
  AND token = '/DRe2F8ZJ1bq62EMHIoHkNHUpXl82ZQEZ941/sU622s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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