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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49585e46bc2a08c6d5709fea66e27a95fd6aa508a519e5e195e1cfa4e5dd67ba' 
  AND token = 'wV31sAVBhUwJ2Hx5gHfCJACi6976DLvaIAQyXfd5NbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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