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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2049380dc491e78b21fe38b803960d1941805d61d4dce3b7863ffd306948e186' 
  AND token = 'xR1RjyKEiOlHmx2JJofsSEouPVs+dTIUzCVCSJhz5jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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