SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '408a00951d82d86e2b893bf075099539b291cf952a7f6b7d0178a0402ef92c6b' 
  AND token = 'ERE/EPXPqut1Z/QblniAVr+36iJAqHKnCSj+Q7nd3u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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