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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ba10fd60776823f6948b7ef21907bc9b5812e963ade44da4388a95254ee8e4d' 
  AND token = 'p11OPfDnJ8Vg0XHT087Mu1ZiiKVp4ehuO9BLm65hF4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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