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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76cd0767e7b2964f00b9b468448e95b7c426b77d3186000515f1e822a0fe2edd' 
  AND token = 'ZGq0IyMxxb7nhbGOoZiygCalP9GxpS93nDBmKpPXawA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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