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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83030ce7feb5c8b16e6876ce855accad2f2929fdf87a8fd25482a09288867056' 
  AND token = '8QubtjKX9ljal68ysqKXr/IAKTqh2rhViV1+nsfWMag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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