SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bf25776a0fb339c52fb475acf03f7f3bbec6db4cf1a278888f42c74e488ec6b' 
  AND token = '0s7rBUznJI+fnwmvh+h40huB0VZQ8XDXPmFBFxGc+qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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