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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bacdf0203e6ff8543b98fab3e2ea7f18eb22d821971a699240f1007a9240e54' 
  AND token = 'LlR+TOnCwlovYzSgOvB2CY4GT214CcW9AyfGw79gw8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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